BR Pluto Led Light Dog Collar 1 inch - Night Walks Flashing Pet Collars (Select from Batteries Powered or USB Rechargeable) Nylon led dog collar is great for walking your pets at night, improve saftey. With adjustable 3 inches length. Excess optical fiber can be trim off. Uses 2 CR2032 batteries, new batteries will last 60 hours on steady or 80 hours flashing. Mode: Slow Flashing, Rapid Flashing, Steady On Included: One led collar + Extra set of batteries